1,2,3,4,4a,5,6,7-octahydro-7-aryl-isoquinolines and derivatives thereof

ABSTRACT

1,2,3,4,4a,5,6,7-Octahydro-7-aryl-isoquinolines and derivatives thereof and their methods of preparation are disclosed. In addition, pharmaceutical compositions containing said compounds and methods for using said compositions as anti-inflammatory, antianginal and antiarrhythmic agents and to reduce blood pressure are reported.

United States Patent Hauck et al.

[ Aug. 26, 1975 l,2,3,4,4A,5,6,7-OCTAHYDRO-7-ARYL- ISOQUINOLINES AND DERIVATIVES THEREOF Inventors: Frederic Peter Hauck, Somerville;

Joseph E. Sundeen, Trenton, both of NJ.

Assignee: E. R. Squibb & Sons, Inc., Princeton, NJ.

Filed: Oct. 5, 1972 Appl. No.: 295,385

US. Cl. 260/288 R; 260/204.9; 260/283 S; 260/283 CN; 260/283 SY; 260/287 R; 260/289 R; 260/290 R; 260/290 H;

Int. Cl C07d 33/50 Field of Search 260/288 R [56] References Cited UNITED STATES PATENTS 3,668,208 6/l972 Baxter 260/287 R Primary Examiner-Donald G. Daus Assistant Examiner-David E. Wheeler Attorney, Agent, or FirmLawrence S. Levinson; Merle J. Smith; Stephen B. Davis 5 7 ABSTRACT 3 Claims, No Drawings 1 1.2 .3.4.4A.5.6,7-OCTAHYDRO-7-ARYL- ISOQUINOLINES AND DERIVATIVES THEREOF There is a continuing search for new chemotherapeutic agents.

This invention relates to blood pressure lowering reagents. anti-inflammatory reagents, antianginal and antiarrhythmic agents of the following general formula:

0 ll ll -CZC wherein Z is NH,NR. oxygen. sulfur, CH==CH. CH or --CH CH or CH Z CH wherein Z is oxygen, sulfur, CH=CH, CH

CH CH NH- or -NR wherein R is lower alkyl, aryl or aryl-loweralkyl and pharmaceutically acceptable salts thereof (hydrochloride, sulfate, phosphate. acetate, citrate, tartrate, etc.).

In addition, this invention encompasses methods for preparing said compounds. the compositions containing said compounds and methods for using said compositions.

Lastly, this invention relates to the novel dienes used to prepare the useful compounds of this invention.

The term loweralkyl is intended to mean a straight or branched chain alkyl group of from one to eight carbon atoms.

The term lower alkoxy is intended to mean a straight or branched chain alkyl group of from one to eight carbon atoms linked directly to an oxygen atom.

The term ary] is intended to mean phenyl, naphthyl and substituted phenyl or naphthyl.

The term substituted when applied to aryl or phenyl is intended to encompass one or two substituents which may be alike or different and are selected from the following group, lower alkyl, lower alkoxy, nitro, halogen, trifluoromethyl, cyano, carbo-lower alkoxy and carboxy.

The compounds of the present invention may exist in a number of isomeric forms such as steroisomeric forms, endo and exo forms, etc. In addition, position isomers of these compounds are disclosed in copending application Ser. No. 295,386 filed on Oct. 5, 1972 now abandoned.

The preferred compounds of this invention are those wherein the functional groups are R CH R H; X and Y are carboxyl, hydroxylmethyl and taken together to form Z is phenyl and methoxyphenyl.

The compounds of this invention may be prepared by the following reaction sequence:

The initial starting materials are prepared according J the procedures shown in The Journal of the Amerian Chemical Society 78, 674 (1956) and 82, 472 1960). These compounds may be converted to the econdary alcohols la by a sodium borohydride reduc- .on in an aqueous alcohol or tertiary alcohols lb by a tandard Grignard Reaction. The alcohols are dehyrated utilizing a refluxing hydrochloric acid-acetic cid mixture followed by quaternization with an alkyl )dide using a nitrile as the solvent. The compounds of le type ll which are obtained are again reduced with odium borohydride in an aqueous alcohol to give comounds of the type Ill.

This invention teaches the procedures for reacting ompounds of the type III with most dienophiles and btain the desired Diels-Alder Adduct of the type IV, Iherein Z, R,, R X and Y are as previously described nd HA is a strong acid, such as hydrochloric acid, suluric acid, phosphoric acid, p-toluenesulfonic acid, etc.

The reactions are generally carried out in a lowerlkanoic acid-lower alkanoic acid anhydride mixture, uch as acetic acid-acetic anhydride, butyric acid buyric anhydride, acetic acid propionic anhydride, etc. t a temperature range of from about 75 to about 75C, preferably 120 to 140C. Reaction rates vary :onsiderably; however, the reactions can be followed iy way of thin film chromatography and are continued lntil completion which is usually within a 24 hour perod.

Typical dienophiles which may be employed in the arocess of this invention are given in Organic Reacions, Vol. IV, p.23, more specifically maleic anhy lride, maleic acid, furmaric acid, diethyl maleate, di- :thyl fumcratc, maleimide, N-substituted maleimides, icrylonitrile, ethyl acrylate, acrylic acid, etc.

IVa

Nll

RO-C

VI alkylating Or acylatinq agen RNli 2) LiAlli ROH HCl The dienes are used in the form of a salt of a strong acid and the amino group is trisubstitutedl Some typical examples of dienes which may be employed in the process of this invention are l-methyl-S-styryl-l ,2,3,6- tetrahydropyridine, l-benzyl-5-p-methoxystyryll,2,3,6-tetrahydropyridine, and l-allyl-5-p-nitrostyryl- 1,2,3 ,-tetrahydropyridine.

In addition, the processes for converting the Diels- Alder Adducts into other useful compounds is taught. Thus the product (lVa) formed by the reaction betweeen maleic anhydride and a compound of the type Ill may be converted into numerous other useful products (V X) according to the following reaction se- III N IVa NH Z

ya nocn. T 71 1) base 2) LiAll'l VIII (acvi, O,

Acyl-OAZH Acyl-O-CH pyridine a no c no "ll l v 2 N-R or [\eyl V The conversion of the Diels-Alder products into the other useful compounds of this invention is also achieved by utilizing the following standard chemical procedures.

Thus where X and/or Y are carboalkoxy, carbonyl, or carboxy groupings, a LiAlH, reduction gives the corresponding alcohol (Gaylord, Reductions with Complex Metal Hydrides" or Organic Reactions, V], p. 469, Wiley).

Where X and/or Y are carboxamido, cyano, imino, or imido, a LiAlH, reductions cause the formation of the corresponding amine.

The above formed alcohols and amine may be converted to the corresponding esters and amides by reaction with an anhydride [(RCO) 0] in pyridine. (Shriner & Fuson, Identifications of Organic Compounds, p. 165 and l77).

The maleic anhydride Diels-Alder Adduct may be reacted with an amine, water or an alcohol (ROH) depending upon the reaction conditions to give an imide, dicarboxylic acid (water and heat), mono-esterified carboxylic acid (ROH and heat) or diester (ROH, HCl and heat) Rodd, Chemistry of Carbon Compounds" Vol. IB, p. 974, Elsevier).

In carrying out the initial process of this invention, a tertiary amine is employed. In order to obtain the useful secondary amines or compounds which are readily prepared from secondary amines, a tertiary benzyl amine is employed in the Diels-Alder Reaction and removed by utilizing a catalytic amount of palladium on charcoal in an organic solvent such as ethanol in the presence of hydrogen. This reaction is of special interest, since one would expect the double bond to be reduced simultaneously; however, such is not the case and high yields of debenzylated olefin is obtained.

The resultant secondary amines are converted to other useful tertiary amines by alkylation using alkylating agents such as dimethyl sulfate, methyl iodide, etc. or amides by acylation using acylating agents such as acetyl chloride, propionic anhydride, etc.

The l,2,3,4,4a,5,6,7-octahydro-7-aryl-isoquinolines of this invention and their pharmaceutically acceptable acid addition salts have been found to be highly useful as antiflammatory agents, blood pressure lowering agents, antianginal agents and antiarrhythmic agents in mammals, such as cattle, dogs, sheep, etc. when administered in amounts ranging from about 0.3 mg to about mg per kg of body weight per day. A preferred dosage regimen for optimum results would be from about 0.6 mg to about l0 mg per kg of body weight per day, and such dosage units are employed that a total of from about mg to about 280 mg of active ingredient for a subject of about 70 kg body weight are administered in a 24 hour period preferrably, 40 mg to 140 mg. The compounds of the present invention in the described dosages are intended to be administered orally; how ever, other routes such as rcctally, intraperitoneally,

subcutaneously, intramuscularly or intravenously may be employed.

The active compounds of the present invention are orally administered, for example, with an inert diluent or with an assimilable edible carrier, or they may be enclosed in hard or soft gelatin capsules, or they may be compressed into tablets, or they may be incorporated directly with the food of the diet. For oral therapeutic administration, the active compounds of this invention may be incorporated with excipients and used in the form of tablets, troches, capsules, elixirs, suspensions, syrups, wafers, chewing gum, and the like. Such compositions and preparations should contain at least 0.1% of active compound. The percentage in the compositions and preparations may, of course, be varied and may conveniently be between about 5% to about or more of the weight of the unit. The amount of active compound in such therapeutically useful compositions or preparations is such that a suitable dosage will be obtained. Preferred compositions or preparations according to the present invention are prepared so that an oral dosage unit form contains between about 5 and 250 milligrams of active compound.

The tablets, troches, pills, capsules and the like may also contain the following: a binder such as gum tragacanth, acacia, corn starch or gelatin; an excipient such as dicalcium phosphate; a disintegrating agent such as corn starch, potato starch, alginic acid and the like; a lubricant such as magnesium stearate; and a sweetening agent such as sucrose, lactose or saccharin may be added or a flavoring agent such as peppermint, oil of Wintergreen, or cherry flavoring. When the dosage unit form is a capsule, it may contain in addition to materials of the above type a liquid carrier such as a fatty oil. Various other materials may be present as coatings or to otherwise modify the physical form of the dosage unit, for instance, tablets, pills, or capsules may be coated with shellac, sugar, or both. A syrup or elixir may contain the active compounds, sucrose as a sweetening agent, methyl and propyl parabens as preservatives, a dye and a flavoring such as cherry or orange flavor. Of course, any material used in preparing any dosage unit form should be pharmaceutically pure and substantially non-toxic in the amounts employed.

The invention will be described in greater detail in conjunction with the following specific examples.

EXAMPLE l l,2,3,6-Tetrahydrol -methyl-5-styrylpyridinc, hydrochloride a. To a solution of 20 g (0.] mole) of a-(3- pyridyl)acetophenone [JACS 82, 472 (1960)] in ml of 50% aqueous ethanol at 3540C is added 3.8 g (0.1 mole) sodium borohydride in portions (cooling to below 40C). Stirring is continued until the reaction temperature falls to 35C. Water is then added and the crude carbinol (20 g) filtered.

b. A mixture of crude 2-( 3-pyridyl)-l-phenylethanol (20 g), glacial acetic acid (200 ml) and concentrated HCl (50 ml) is refluxed for 16 hours. then evaporated to dryness in vacuo. The oily hydrochloride is taken up in water. extracted with ether and methylene chloride. and then liberated with bicarbonate. Extraction (CH CI and drying (K CO affords 13 g of B-(B- pyridyl )styrene.

c. Without purification B-(3-pyridyl)styrene is treated with 10 ml of methyl iodide in 100 ml of absolute ethanol at 40C for a few minutes, then cooled. Addition of ether causes separation of 10.4 g of the crystalline methiodide (32%).

d. A solution of B(3-pyridyl)styrene, methiodide 10.4 g. 0.032 mole) in 200 ml of 50% aqueous methanol at 40 is treated in portions with 6.0 g (0.16 mole) sodium borohydride, then stirred at 35C for 2 hours. The mixture is cooled and extracted with ether. dried (KOH and K CO and evaporated to yield 6.0 g (94%) of a yellow oil which crystallizes slowly at C.

e. l,2,3,6-Tetrahydro-3-styryl-l-methylpyridine, hydrochloride is prepared by treating the free base (25g) in 400 ml of isopropanol with concentration HCl in iso propanol. Cooling at 0C affords on drying of the filtered salt in vacuo. 28 g (95%) of the named compound.

A g sample of the crude hydrochloride is recrystallized twice to afford an analytical sample (3.3 g. 31%). m.p. 237-238C.

Anal. Calcd. for C H N HCI: C. 71.33; H, 7.70; N, 5.94; Cl, 15.04. Found: C, 71.47; H, 7.94; N. 5.93; CI, 15.09.

EXAMPLES 2-5 According to the method of Example 1, ifone substitutes in place of the a-(3-pyridyl)aeetophenone, the following compounds:

a-( 3-pyridyl )-m-isopropylacetophenone,

a-( 3-pyridyl )-o-chloropropylacctophenone.

a-(3-pyridyl)-p-trifluoromethylacetophenone, and

oz-( 3-pyridyl p-carbomethoxyacetophenone, one obtains the hydrochlorides of:

l,2,3,6-tetrahydrol -methyl-5-m-isopropylstyrylpyridine.

l,2,3,6-tetrahydrol -methyl-5-ochlorostyrylpyridine,

l,2,3,6-tetrahydrol -methyl-5-p-trifluoromethylstyrylpyridine. and 1,2,3,6-tetrahydr0-l-methyl-5-p-carbomethoxystyrylpyridine, respectively.

EXAMPLES 6-9 According to the method of Example 1, if one substitutes in place of the methyliodide. the following compounds ethyl iodide,

phenethyl iodide,

isopropyl iodide and benzyl iodide, one obtains the hydrochlorides of:

1.2.3.6-tctrahydrol -ethyl-5-styrylpyridine,

l ,2.3,6-tetrahydro-1-phenethyl-5-styrylpyridine,

1,2.3,6-tctrahydro l -isopropyl-5-styrylpyridine, and

l,2,3.6-tetrahydro-1-benzyl-5-styrylpyridinc. respectively.

EXAMPLE 10 1.2.3 .6-Tetrahydro-5-(p-methoxystyryl I methylpyridine. hydrochloride a. To a solution of 3 moles of lithium diisopropylamide in 3 liters ether is added 3 moles of B-pieoline. After one-half hour. a solution of 1 mole methyl anisate in ether is added dropwise. After 1 hour under reflux. the mixture is cooled and decomposed with water. After all the lithium has dissolved. the layers are separated. The organics are washed with water. dried (magnesium sulfate) and distilled. The product is collected at l165C at 0.3 mm Hg and recrystallized from benzene-pet ether to yield 88 g 39%) 4-methoxy-a-( 3- pyridyl)-acetophenone. [Miller, Osuch. Goldberg. and Levine, JACS, 78. 674 (1956) and Raynolds and Levine, JACS, 82, 472 (1960)].

b. To a solution of 25 g (0.] 1 moles) of the above acetophenone in 250 ml 50% aqueous ethanol stirring in an ice bath is added 4.2 g (0.1 1 moles) sodium borohydride in portions (T 30C). This is stirred for 1 hour at room temperature. Water is added and filtration affords 22 g (88%) l-(4-methoxyphenyl)-2-(3-pyridyl)- ethanol.

c. A solution of 58 g (0.253 moles) of the above alcohol in 600 ml glacial acetic acid and 150 ml hydrochloric acid is stirred under reflux overnight. The solution is cooled and evaporated in vacuo. Benzene is added and evaporated twice. The yellow solid residue is dissolved in water and extracted with ether, dichloromethane, and again ether to remove impurities. The aqueous layer is basified with sodium bicarbonate and extracted with dichloromethane. The organic layers are dried (sodium carbonate) and evaporated to give a quantitative yield of 3-(p-methoxystyryl)pyridine.

d. The above styrene (53 g, 0.253 moles) is dissolved in 350 ml acetonitrile with heating. Methyl iodide (0.9 moles) is added dropwise over 15 minutes with stirring. This is refluxed for 1 hour and cooled to room temperature. Ether is added and the solution is allowed to stand in a cold room overnight. Filtration yields 55.6 g(63%) crystalline 3-(p-methoxystyryl)-pyridine, methiodide.

e. To 55.6 g (0.157 moles) of the above methiodide stirring in 1 liter 50% aqueous methanol is added 18 g (0.47 moles) sodium borohydride in portions over 1 hour (T S 35C). This is stirred for l hour. Water is added and white solid filtered. This solid is dissolved in ether and dried (magnesium sulfate). Evaporation in vacuo yields 27.5 g 1.2.3.6-tetrahydro-5-(pmethoxystyryl)-l-methylpyridine. The aqueous layer is extracted with ether. The organic layer is dried (magnesium sulfate and evaporated to yield an additional 5 g product.

f. A 5 g sample of the above tetrahydropyridine is dis solved in ether. With stirring, hydrochloric acid in isopropanol-ether is added until the solution is acidic to pH paper. The white solid is filtered to yield 5.5 g l.2.3,6-tetrahydro-5-(p-methoxystyryl l methylpyridine. hydrochloride.

Recrystallization of 5.5 g from isopropanol-ether affords an analytical sample, 1.7 g, mp 177-187C (d).

Anal. Calcd for C H NO HCl: C, 67.79; H, 7.59;

N, 5.27; Cl. l3.34. Found: C. 67.92; H. 7.38; N, 5.05;

Cl, l3.ll.

EXAMPLE 1 l 3a.4,6.7,8,9,9a.9b Octahydro-4-( p-mcthoxyphenyl 2,7-dimethyl-2l l-pyrrolo[3,4-flisoquinoline-1.3-dione A solution of g (0.065 moles) l,2,3,6-tetrahydro- 1-methyl-5-p-methoxystyrylpyridine (free base), 15 g N-methylmaleimidc, 150 ml toluene and mgs hydroquinone is refluxed under nitrogen overnight. The solution is allowed to cool and evaporate. Benzene is added and evaporated twice. Water is added. and the oil is extracted with benzene. The organic layers are evaporated. The residue crystallizes and filtration and washing with ether yields 7.85 g 3a,4,6,7,8,9,9a.9boctahyd ro-4-( p-methoxyphenyl )-2,7-dimethyl-2flpyrrolo[ 3.4-f1isoquinoline-1,3-dione. Chromatography of the mother liquor on basic alumina (activity ll) yields an additional 3.2 g (50%) crystals.

Recrystallization of 1.8 g from dichloromethanehexane affords the analytical sample. 1.3 g. mp 129-130C.

Anal. Calcd for C20H2402ijiC, H, l ll N, 8.23; Found: C, 70.67; H, 7.00; N. 7.94.

EXAMPLE 12 1.2.3 ,4,4a.5 ,6,7-Octahydro-2-methyl-7-phenyl-5 ,6- isoquinolinedicarboxylic acid, hydrochloride 1,2,3.6-Tetrahydro-1-methyl-5-styrylpyridine (23 g, 0.098 mole) and maleic anhydride (60 g, 0.61 mole) in 400 ml of a 1:1 mixture of acetic anhydride and acetic acid is treated with a few crystals of hydroquinone, brought to reflux for a few minutes, then cooled to room temperature over 1.5 hours. Benzene (1.5 l.) is added to the dark mixture and the gummy black precipitate is triturated until granular. After filtration and thorough washing with benzene. the solid is suspended in water overnight, then heated for 4 hours on steam. A decolorizing carbon is added, the hot mixture is filtered and the dark solution is evaporated to a viscous oil in vacuo. Crystallization from approximately 200 ml isopropanol affords l l g of adduct (32%), a single isomer asjudged from its NMR spectrum. Two recrystallizations afford an analytical sample, mp 218223C. (dec.).

Anal. Calcd. for C H O N HCl: C, 61,45; H. 6.30; N, 3.98; CI, 10.08. Found: C, 61.27; H, 6.15; N, 3.95; C1, 10.14.

EXAMPLES 13-17 According to the method of Example 12, if one substitutes in place of the maleic anhydride, the following compounds:

acrylic acid,

acrylonitrile,

ethyl acrylate,

nitroethylene and p-quinone, one obtains the hydrochlorides of:

l,2,3,4,4a.5.6,7-octahydro-2-methyl-7-phenyl-6- carboxyisoquinoline, 1,2.3,4,4a,5.6,7-octahydro-2methyl-7-phenyl-6- cyano-isoquinoline, 1,2,3,4,4a.5.6,7octahydro-2-methyl-7-phenyl-6- carboethoxyisoquinoline, 1.2.3.4,4a,5,6,7-octahydro-2-methyl-7-phenyl-6- nitro-isoquinoline. and

l,2,3,4,6,6a,7,10,10a,l0bdecahydro-3-methyl-6- phenylbenzl flisoquinoline-7, l O-dione. respectively.

EXAMPLE 18 Dimethyl 1,2,3 ,4,4a,5 ,6,7-Octahydro-2methyl-7'phenyl-5 .6- isoquinolinedicarboxylate A solution of 18.5 g Diels-Alder adduct of Example 12 in 1 liter methanol with 20 ml hydrochloric acid in isopropanol is refluxed overnight. The solution is cooled and evaporated. The residue is dissolved in water. This is basified with 10% sodium hydroxide solution and extracted with dichloromethane. The organic layers are dried (potassium carbonate) and evaporated to yield 12 g (63%) oily diester.

EXAMPLE 19 According to the method of Example 18. if one substitutes in place of the methanol, the following compounds:

ethanol and 2-methylpropanol one obtains the corresponding diethyl methylpropyl carboxylate.

EXAMPLE 20 l,2.3,4,4a,5,6,7-Octahydro-2-methyl-7-pheny1-5,6- isoquinoline dimethanol A solution of 12 g (0.035 moles) of the diester of Example 18 in ml dichloromethanezether 1:1 is added to a slurry of 2.66 g (0.07 moles) lithium aluminum hydride in 300 ml dichloromethanezether (1:1) with stirring under nitrogen. This is refluxed for 4 hours and cooled to room temperature. Saturated sodium carbonate solution is added until the mixture turned white. This is filtered and the solids are washed with dichloromethane and 10% ethanol in dichloromethane. The filtrates are evaporated to yield 8.3 g of 1 ,2,3,4.4a- ,5,6.7-octahydro-2-methyl-7-phenyl-5,6- isoquinolinedimethanol. Crystallization from ethyl acetate yields 3.6 g (35%) pure diol.

Recrystallization of 1.5 g from methanol-ethyl acetate affords the analytical sample, 1 g. mp -177C.

Anal. Calcd for C H N0 C, 75.22; H, 8.77; N, 4.87. Found: C, 75.09; H, 9.00; N, 4.59.

EXAMPLES 21-23 According to the method of Example 30, if one substitutes in place of the dimethyl 1,2,3,4,4a,5,6,7- octahydro-Z-methyl-7-phenyl-5,6-isoquinoline dicarboxylate, the following compounds:

dimethyll ,2,3,4,4a,5,6,7-octahydro-2-ethy1-7-mchloro-phenyl-S,6-isoquinolinedicarboxylate.

and di-2- dimethyl l,2,3,4,4a,5,6,7-octahydro-2methyl-7-omethylphenyl-6-cyanoisoquinolinedicarboxylate, and

dimethyl 1,2,3,4 4a,5 ,6,7-octahydro-2-benzyl-7-mtrifluoromethylpheny1-5 ,6-dicyanoisquinolinedicarboxylate, one obtains:

1,2,3,4,4a,5,6,7-octahydro-2-ethyl-7-mchlorophenyl-5,6-isoquinolinedimethanol, 1.2,3,4,4a,5,6,7-octahydro-2-methyl-7-omethylphenyl-6-aminomethylisoquinolinedimethanol, and

1 1 1,2,3 .4,4a.5.6,7-octahydro-2-benzyl-7-mtrifluoromethylphenyl-6,7-diaminomethylisoquinolinedimethanol. respectively.

EXAMPLE 24 l,2,3,4,4a,5,6,7-Octahydro-2-methyl-7-phenyl-5 .6- soquinolinedimethanol, diacetate ester. hydrochloride To a solution of 36 g (0.013 moles) of the compound irepared in Example 20 in 40 ml pyridine at C is idded 20 ml acetic anhydride dropwise with stirring. [his is stirred for 1 hour at 0C and overnight at room emperature. The solution is evaporated. The residue is lissolved in ether and stirred with saturated sodium bi- :arbonate solution for one-half hour. The layers are ieparated and the aqueous is extracted with ether. The rganic layers are dried (magnesium sulfate) and evap- )rated to yield 4 g (83%), l,2,3,4,4a,5,6,7-octahydro- Z-methyl-7-phenyl-5,6-isoquinolinedimethanol, diace- .ate ester.

The diacetate ester is dissolved in ether and hydro- :hloric acid in isopropyl alcohol-ether is added until :he solution is acidic to pH paper. The solution is filzered and the solid is recrystallized from isopropyl al- :ohol-ether to yield 3.2 (72%) of the hydrochloride ialt.

Recrystallization of 2 g from isopropyl alochol-ether affords an analytical sample, l.5 g, mp l8ll82C.

Anal. Calcd for C H NO CI: C, 64.78; H, 7.4l; N, 3.43; C], 8.69. Found: C, 64.82; H, 7.l6; N, 3.38; Cl, 8.75.

EXAMPLE 25 l ,2.3,4,4a.5,6.7-0ctahydro-7-(p-methoxyphenyl )-2- methyl-5,6-isoquinolinedimethanol, diacetate ester, hydrochloride a. A solution of l6 g (0.06 moles) l,2,3,6-tetrahydrol-methyl-S-p-methoxystyrylpyridine. 37 g ground ma- Ieic anhydride, 130 ml glacial acetic acid, [30 ml acetic anhydride, and 50 mg hydroquinone is refluxed under nitrogen for one-half hour. The solution is allowed to cool and evaporate to an oil. Benzene is added and evaporated twice. The crude Diels-Alder adduct is dissolved in 500 ml methanol and 20 ml hydrochloric acid in isopropanol and refluxed for l8 hours. The solution is allowed to cool and evaporate. The residue is dissolved in water and extracted with ether and dichloromethane. The aqueous is basified with [0% sodium hydroxide and extracted with dichloromethane. These organic layers are dried (sodium carbonate) and evaporated to yield 10 g of the diestcr. The organic layers from the first extraction are evaporated and the residue is dissolved in water and extracted with ether. The aqueous portion is basified and extracted as above to yield an additional 9.4 g (86%) of the diester.

b. A solution of l g (0.04 moles) of the dicstcr in 100 ml dichloromethane:ethcr (l:l) is added to a slurry of 3.14 g lithium aluminum hydride in 300 ml dichloromethanczether l:l) stirring under nitrogen. This is refluxed for 4 hours and allowed to cool to room temperature. Saturated sodium carbonate solution is added until the solution turned white. This is filtered and the solids are washed with dichloromethane and ethanol in diehloromethane. The filtrates are evaporated to yield. respectively. 7g and 4 g (8571) crude l 2,351,411.5.6,7'octahydro-7-( pmethoxyphenyl)-2-methyl-5,6-isoquinolinedimcthanol.

To a solution of 4.3 g (0.0l35 moles) of pure isoquinolinedimethanol one obtains from chromatography of the 7 g sample on basic alumina (activity 11]) in 40 ml pyridine at 0C is added 20 ml acetic anhydride dropwise. This is stirred for l hour at 0C and overnight at room temperature. The solution is evaporated and benzene is added and evaporated twice. The residue is dissolved in ether and stirred with saturated sodium bicarbonate solution for one-half hour. The layers are separated and the aqueous portion extracted with ether. The organic layers are dried (magnesium sulfate) and evaporated to yield 4 g (74%) l,2,3.4.4a,5,6,- 7-octahydro-7-( p-methoxyphenyl )-2-methyl 5 ,6- isoquinolinedimethanol. diacetate ester. A 4 g sample is dissolved in ether and hydrochloric acid in isopropanoLether is added until the solution is acidic to pH paper. The solid is filtered and recrystallization from isopropanol-ether yields 4.4 g 100%) the hydrochloride.

Recrystallization from isopropanol-ether affords an analytical sample, 2.4 g, mp l64-l6SC.

Anal. Calcd for C H NO CI: C, 63.07; H, 7.36; N. 3.20; Cl, 8.09. Found: C, 62.67; H, 7.06; N, 3.05; CI, 8.20.

EXAMPLE 26 l,3.3a,4,6,7.8,9,9a,9b Decahydro-4-( pmethoxyphenyl )-2.7dimethyl-2flpyrrolo[ 3 ,4- flisoquinoline A solution of 6.7 g (0.02 moles) of 3a.4.6,7,8,9,9a,9 b-octahydro-4-(p-methoxyphenyl)-2,7-dimethyl-2H- pyrrolol3,4-flisoquin0line-l,3-dione in I00 ml of dichloromcthaneether (l:l) is added to a slurry of 3 q (0.08 moles) lithium aluminum hydride in 300 ml dichloromethane-ethcr (l:l) under nitrogen. This is refluxed for 18 hours. Saturated sodium carbonate solution is added at room temperature until the reaction is white. The salts are filtered and washed with dichloromethane. The combined filtrates are evaporated to yield 5.5 g l,3.3a,4,6,7,8.9,9a.9b-decahydro-4 (p-methoxyphenyl )2,7-dimethyl-ZH-pyrrolol 3 ,4- f]isoquinoline. This is dissolved in isorpopanol-ether. and hydrochloric acid in isopropanol is added until the solution is acidic to pH paper. Excess ether is added and the white solid product is filtered.

EXAMPLE 27 1.2.3 ,4,4a,5,6.7-Octahydro-7-( p-methoxyphcnyl )-5,6- isoquinolinedimethanol, diacetate ester, oxalate An 1 l g (0.023 mole) sample of 2-benzyll ,2,3,4,4a,5,6.7-octahydro 7-( p-methoxyphenyl )-5.6- isoquinolinedimethanol, (ii-acetate ester. is debenzylated in 200 ml absolute ethanol with l g palladium on carbon. After 4 days at 30 psi on the Parr apparatus. the sample is filtered and the catalyst is washed with ethanol. The combined filtrates are evaporated. Column chromatography (basic alumina, activity ll in chloroform) yields about 4.6 g (5292 debenzylated diacetate, and 4.6 g of the starting benzyl compound. A 2.3 g (0.006 mole) sample of this debenzylatcd material is dissolved in l0 ml isopropanol and 0.67 g (0.005 moles) oxalic acid is next added. This is swirled and heated slightly to dissolve the acid. The addition of ether affords about 2.5 g l00fir crystalline 1.2.3.4.421- ,5,6.7-octahyd ro-7-( p-mcthoxyphenyl )-5 .6-

13 isoquinolinedimethanol. diacctatc ester, oxalate salt (1:1). Further recrystallization of 2.5 g from methanolisopropanol-ether gives and analytically pure sample, 0.95 g, mp 105-l C.

EXAMPLES 28-29 EXAMPLE 30 Preparation of capsule formulation ingredient Milligrams per Capsule line-dicarboxylic acid 200 Starch 95 Magnesium stearate S The active ingredient, starch and magnesium stearate are blended together. The mixture is used to fill hard shell capsules of a suitable size at a fill weight of 300 milligrams per capsule.

EXAMPLE 3i Preparation of tablet formulation Ingredient Milligrams per Tablet l,2,3.4,4a,5,6,7 octahydru2' methyl-7-phenyl-5,b-isoquinoline dimethanol lUO Lactose 200 Corn starch (for mix) 50 Corn starch (for paste) 50 Magnesium stearate 6 The active ingredient, lactose and corn starch (for mix) are blended together. The corn starch (for paste) is suspended in water at a ratio of 10 grams of corn starch per 80 milliliters of water and heated with stirring to form a paste. This paste is then used to granulate the mixed powders. The wet granules are passed through a No. 8 screen and dried at lF. The dry granules are passed through a No. l6 screen. The mixture is lubricated with magnesium stearate and compressed into tablets in a suitable tableting machine. Each tablet contains 300 milligrams of active ingredient.

EXAMPLE 32 Preparation of oral syrup formulation Ingredient Amount l,2.3.4,4a.5.6,7-octahydro-7- (pmiethoxyphcnyl 2-methyl-5 6 isoquinoline dicarboxylic Still mg Sorbitol solution (71 NF.) 40 ml Sodium bcnzoatc lSt) mg Sucaryl mg Saccharin 10 mg Red Dye (FD. & C. No. 2) l0 mg Cherry flavor 50 mg Distilled Water qs to lUO ml The sorbitol solution is added to 40 milliliters of distilled water and the active ingredient is suspended therein. The sucaryl, saccharin, sodium benzoate, flavor and dye are added and dissolved in the above solution. The volume is adjusted to milliliters with distilled water.

Other ingredients may replace those listed in the above formulation. For example, a suspending agent such as bentonite magma, tragacanth, carboxymethylcellulose, or methylcellulose may be used. Phosphates, citrates or tartrates may be added as buffers. Preservatives may include the parabens, sorbic acid and the like and other flavors and dyes may be used in place of those listed above.

What is claimed is:

1. A compound of the formula:

wherein Z is selected from the group consisting of phenyl and substituted phenyl wherein said phenyl sub stituent is selected from the group consisting of lower alkyl of l to 8 carbons. methoxy, nitro, cyano, halogen, and trifluoromethyl; R is selected from the group consisting of hydrogen, lower alkyl of l to 8 carbons, and benzyl; and R is selected from the group consisting of hydrogen, lower alkyl of l to 8 carbons, phenyl and benzyl', and pharmaceutically acceptable acid addition salts thereof.

2. The compounds of claim 1 wherein R is methyl: R is methyl; and Z is selected from the group consisting of phenyl and methoxyphenyl.

3. The compound of claim 2 having the name l ,3,3a,- 4,6,-7 ,8,9,9a,9b-decahydro-4-( p-methoxyphenyl )-2,7

dimethyl-2fl-pyrrolo[ 3,4-flisoquinoline.

Page 1 of 2 UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTION PATENT NO. I 3 r 901 897 DATED Aug. 26, 1975 |NVENTOR(S) F. P. Hauck et al It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Col. 1, formula IV, should read as follows:

Z R X 2 Rl Col 4 at the top of the column, formula IV should read as follows: Z R

Y \LI HA Col. 4, line 30, in formula III,

N N I l l "R HA" should read R -HA Col. 3, in the reaction sequence, after line 45 C should i read Page 2 of 2 1 UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTION PATENT NO. 9 DATED Aug. 26, 1975 INVENTOR(S) F. P. Hauck et al It is certified that error appears in the aboveidentified patent and that said Letters Patent are hereby corrected as shown betow:

II H Col. 9, llne 21, C H O should read C H N O Signed and Sealed this thirtieth D f March 1976 [SEAL] A (test:

RUTH C. MASON C. MARSHALL DANN Arlr'slr'ng Officer Commissioner uj'Parenrs and Trademarks 

1. A COMPOUND OF THE FORMULA
 2. The compounds of claim 1 wherein R1 is methyl; R is methyl; and Z is selected from the group consisting of phenyl and methoxyphenyl.
 3. The compound of claim 2 having the name 1,3,3a,4,6,-7,8,9,9a, 9b-decahydro-4-(p-methoxyphenyl)-2,7-dimethyl-2H-pyrrolo(3,4-f)isoquinoline. 